Open dash daughter
About the Open dash daughter PCB
Open dash daughter is an open source ESP32 PCB design by physiii, published on GitHub. It is a 2-layer board measuring 165.5 × 107.3 mm, with 161 components from 81 distinct parts.
Its main chip is the ESP-WROOM-32, from the ESP32 family. Other key parts include the LM2576-ADJ, REG-3.3v, molex-2x4-5.7mm, MCP2551-I_SN and SI7020-A20. By type, the board carries 53 capacitors, 50 resistors, 19 ICs, 12 diodes, 11 inductors and 5 transistors.
Main components on the Open dash daughter
Open dash daughter bill of materials (BOM)
161 components, 81 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 4 | LM2576-ADJ | Regulator-LM2576 | U1, U2, U3, U4 |
| 1 | REG-3.3v | TO-252-2 | U5 |
| 1 | ESP-WROOM-32 | ESP-WROOM-32 | U6 |
| 3 | molex-2x4-5.7mm | molex-2x4-5.7mm | U7, U14, U16 |
| 1 | MCP2551-I_SN | SOIC-8_3.9x4.9mm_P1.27mm | U8 |
| 1 | SI7020-A20 | SI7020-A20 | U9 |
| 1 | Power-Monitor-INA219 | SOT-23-8_Handsoldering | U10 |
| 1 | TDA7297 | TO-220-15_Vertical_StaggeredType1_Py5.08mm | U11 |
| 1 | Si4740 | QFN-24-1EP_4x4mm_Pitch0.5mm | U12 |
| 1 | A2235-H | GSM_Module_17.8x16.5mm_A2235-H | U13 |
| 1 | radio-housing-mounts | radio-housing-mounts | U15 |
| 1 | USB_IC-CP2104 | QFN-24-1EP_3x3mm_Pitch0.4mm | U17 |
| 1 | 74LVC1G17SE-7 | SOT-353_SC-70-5_Handsoldering | U18 |
| 1 | OPA1662 | MSOP-8_3x3mm_P0.65mm | U19 |
| 1 | Q_NPN_BEC | SOT-23 | Q1 |
| 2 | Q_NJFET_DGS | SOT-23 | Q2, Q3 |
| 1 | Q_NPN_BCE | SOT-23 | Q4 |
| 1 | Q_PNP_BCE | SOT-23 | Q5 |
| 1 | Conn_02x06_Odd_Even | PinHeader_2x06_P2.54mm_Vertical | J4 |
| 1 | CONN_01X04 | PinHeader_1x04_P2.54mm_Vertical | P1 |
Show 61 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CONN_01X02 | PinHeader_1x02_P2.54mm_Vertical | P2 |
| 1 | CONN_01X04 | PinHeader_2x04_P2.54mm_Vertical | P4 |
| 3 | Conn_01x02 | PinHeader_1x02_P2.54mm_Vertical | AMF_Antenna1, GPS_ANT1, RX_TX1 |
| 1 | Conn_01x02 | PinHeader_1x03_P2.54mm_Vertical | AUDIO_IN1 |
| 3 | SW_PUSH | SW_SPST_KMR2 | FACTORY1, PROG1, REBOOT1 |
| 1 | 26V Zener | D_SMB | D1 |
| 4 | D_Schottky | D_SMA | D2, D3, D4, D5 |
| 1 | LED-0603-G | LED_0603_1608Metric_Pad0.82x1.00mm_HandSolder | D6 |
| 1 | PESD1CAN | SOT-323_SC-70_Handsoldering | D7 |
| 2 | D1213A-01SO-7 | SOT-23 | D8, D9 |
| 3 | LED | LED_0603_1608Metric_Pad0.82x1.00mm_HandSolder | D10, D11, D12 |
| 1 | L_47uH | Inductor-SRR1210 | L1 |
| 3 | L_100uH | Inductor-SRR1210 | L2, L3, L4 |
| 2 | 6.8uH | Coilcraft_0805PS_Handsoldering | L5, L6 |
| 1 | 33nH | L_0603_HandSoldering | L7 |
| 1 | 122nH | L_0603_HandSoldering | L8 |
| 1 | 220uH | Coilcraft_1008PS_Handsoldering | L9 |
| 1 | 1mH | L_7.3x7.3_H4.5 | L10 |
| 1 | 33uH | L_6.3x6.3_H3 | L11 |
| 4 | 180uF | CP_Radial_D8.0mm_P3.50mm | C1, C2, C3, C4 |
| 2 | 1000uF | CP_Radial_D10.0mm_P5.00mm | C5, C6 |
| 2 | C_1000uF | CP_Radial_D10.0mm_P3.50mm | C7, C8 |
| 2 | C_4.7uF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C9, C12 |
| 6 | C_10uF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C10, C24, C44, C45, C51, C52 |
| 4 | C_1uF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C11, C23, C48, C49 |
| 1 | C_10uF | C_0603 | C13 |
| 2 | C_0.1uF | C_0603 | C14, C43 |
| 4 | 0.1uF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C15, C28, C39, C41 |
| 2 | 560pF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C16, C17 |
| 3 | C_0.1uF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C18, C19, C50 |
| 2 | 0.22uF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C20, C21 |
| 1 | 470uF | CP_Radial_D8.0mm_P3.50mm | C22 |
| 1 | 100nF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C25 |
| 1 | 3.9pF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C26 |
| 1 | 18pF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C27 |
| 1 | 270pF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C29 |
| 1 | 1200pF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C30 |
| 3 | 0.47uF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C31, C33, C34 |
| 1 | 100uF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C32 |
| 1 | 18nF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C35 |
| 2 | 22nF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C36, C40 |
| 2 | 0.39uF | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C37, C38 |
| 2 | C_1uF | C_0603 | C42, C46 |
| 2 | C_100p | C_0603_1608Metric_Pad0.99x1.00mm_HandSolder | C47, C53 |
| 17 | R_10k | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R1, R2, R3, R13, R14, R15, R16, R17 +9 |
| 2 | R_7k15 | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R4, R10 |
| 1 | R_2k32 | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R5 |
| 2 | R_8k87 | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R6, R8 |
| 2 | R_1k | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R7, R9 |
| 1 | R_1k3 | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R11 |
| 1 | R_1k4 | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R12 |
| 2 | 4.7k | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R18, R24 |
| 2 | 100 | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R19, R20 |
| 1 | R_10 | R_2512_6332Metric_Pad1.49x3.40mm_HandSolder | R21 |
| 3 | 249 | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R25, R27, R28 |
| 1 | 10M | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R26 |
| 1 | 10 | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R29 |
| 3 | 2k | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R30, R31, R32 |
| 1 | R_470 | R_0603 | R37 |
| 2 | R_12k | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R40, R41 |
| 8 | R_20k | R_0603_1608Metric_Pad0.99x1.00mm_HandSolder | R43, R44, R45, R46, R47, R48, R49, R50 |
Open dash daughter design files
The KiCad project lives in the physiii/open-dash-daughter repository on GitHub; these links point at the commit this page was built from.
Open dash daughter: common questions
What microcontroller does the Open dash daughter use?
The Open dash daughter is built around the ESP-WROOM-32, from the ESP32 family.
How big is the Open dash daughter PCB?
The Open dash daughter measures 165.5 × 107.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Open dash daughter?
161 components, from 81 distinct parts. The full bill of materials is listed on this page.
Where can I download the Open dash daughter design files?
From the physiii/open-dash-daughter repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Open dash daughter design in my own project?
The repository has no license, so all rights stay with physiii. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Open dash daughter without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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